Add Python 3.15 to the build/test matrix (12.9.x backport) by leofang · Pull Request #2133 · NVIDIA/cuda-python

leofang · 2026-05-22T21:26:03Z

Backport of #2108 to the 12.9.x branch so that cuda-bindings 12.9.x wheels are available for Python 3.15, which the main branch needs in order to build cuda-core.

Changes

Add 3.15 / 3.15t to the build matrix in build-wheel.yml
Upgrade cibuildwheel from v3.4.1 to v4.0.0rc1 (required for cpython-prerelease support)
Add cpython-prerelease to CIBW_ENABLE (v4.0 enables free-threading by default, so cpython-freethreading was dropped)
Drop 3.13t from build and test matrices (already removed on main)
Work around GNU link.exe (Git for Windows) shadowing MSVC link.exe — only affects pre-release Python on Windows where numpy must build from source
Add test entries for 3.15 / 3.15t on all platforms (linux amd64, linux arm64, win-64)
Add missing Windows pull-request entries for 3.10, 3.11, 3.14, 3.14t to sync with main
Pre-build numpy wheel for Python 3.15 via cibuildwheel (no pre-built wheel available yet). numpy 2.4.x's [tool.cibuildwheel] config is incompatible with cibuildwheel v4.0, so we strip it and build with -Dallow-noblas=true
Fix test_graphics_api_smoketest on py3.10/3.11 Windows: catch OSError (pyglet raises FileNotFoundError when opengl32.dll is missing on older Python)
Exclude Python 3.15 wheels from release publishing (release.yml) and release upload (ci/tools/download-wheels) — 3.15 is pre-release and not ready for PyPI

Adaptation notes

The following changes from #2108 were not needed on 12.9.x:

test-wheel-linux.yml — already has allow-prereleases: true
cuda_bindings/pyproject.toml — matplotlib was already absent from test deps
cuda_core/pyproject.toml — cffi was already absent from test deps
CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: "" — not needed because 12.9.x already sets an explicit delvewheel command that overrides the v4.0 default

Backport of NVIDIA#2108 to the 12.9.x branch so that cuda-bindings 12.9.x wheels are available for Python 3.15, which the main branch needs in order to build cuda-core. - Add 3.15 / 3.15t to the build matrix - Upgrade cibuildwheel to v4.0.0rc1 (required for cpython-prerelease) - Enable cpython-prerelease in CIBW_ENABLE - Add amd64-only test entries for 3.15 / 3.15t (CUDA 12.9.1)

copy-pr-bot · 2026-05-22T21:26:06Z

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leofang · 2026-05-22T21:28:18Z

/ok to test a79f6c6

leofang · 2026-05-22T21:41:52Z

/ok to test 2598994

- Remove 3.13t from build matrix and all test matrices (already dropped on main). - Work around Meson finding GNU link.exe (from Git for Windows) instead of MSVC link.exe when building numpy from source for pre-release Python on Windows.

leofang · 2026-05-22T22:14:25Z

/ok to test d64eefd

leofang · 2026-05-22T22:15:19Z

+      - name: Hide GNU link.exe so Meson finds MSVC link.exe
+        if: ${{ startsWith(inputs.host-platform, 'win') }}
+        run: |
+          if [ -f "/c/Program Files/Git/usr/bin/link.exe" ]; then
+            mv "/c/Program Files/Git/usr/bin/link.exe" "/c/Program Files/Git/usr/bin/link.exe.bak"
+          fi


Note: Adding this workaround because it choked Meson:

..\meson.build:1:0: ERROR: Found GNU link.exe instead of MSVC link.exe in C:\Program Files\Git\usr\bin\link.EXE. This link.exe is not a linker. You may need to reorder entries to your %PATH% variable to resolve this.

https://github.com/NVIDIA/cuda-python/actions/runs/26313382675/job/77467388926?pr=2133#step:29:111

- Add arm64 entries for 3.15 / 3.15t (linux pull-request) - Add Windows pull-request entries for 3.10, 3.11, 3.14, 3.14t, 3.15, 3.15t to keep in sync with main

leofang · 2026-05-22T23:04:22Z

/ok to test 8a2c9c3

NumPy does not ship pre-built wheels for Python 3.15 yet. Build the wheel from source during the build stage (where compilers are available), upload it as an artifact, and download/install it in the test stage before running cuda.bindings tests.

leofang · 2026-05-22T23:27:09Z

/ok to test a7692b4

Linux: build numpy via cibuildwheel inside the manylinux_2_28 container so the wheel is compatible with the ubuntu:22.04 test container (glibc 2.35). Previously, pip wheel on the host produced a linux_x86_64 wheel linked against glibc 2.38+, causing ImportError at test time. Windows: add explicit bash shell to the numpy install step in the test workflow — PowerShell does not expand *.whl globs. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

leofang · 2026-05-30T14:34:45Z

/ok to test ee8db04

- Patch numpy 2.4.x pyproject.toml to remove the "cpython-freethreading" enable group, which is invalid in cibuildwheel v4.0 (fixed on numpy main but not yet released). - Consolidate Linux/Windows numpy builds into a single cibuildwheel step, matching how cuda.core and cuda.bindings are built. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

leofang · 2026-05-30T15:05:07Z

/ok to test 3f1f3c0

numpy 2.4.x ships [tool.cibuildwheel] config (OpenBLAS scripts, cpython-freethreading, ILP64 settings) incompatible with cibuildwheel v4.0. Strip the entire section from the sdist and build with -Dallow-noblas=true — we only need numpy for testing, not optimized linear algebra. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

leofang · 2026-05-30T15:31:38Z

/ok to test b808899

The previous regex stripped everything from [tool.cibuildwheel] to EOF, which also removed [tool.meson-python] with its vendored meson path. Use a line-by-line approach to only remove cibuildwheel sections. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

leofang · 2026-05-30T16:32:45Z

/ok to test bd3e990

On py3.10/3.11, pyglet raises FileNotFoundError (an OSError subclass) when opengl32.dll is missing, rather than AttributeError as on py3.12+. Add OSError to the except clause so the test skips gracefully. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

leofang · 2026-05-30T17:48:26Z

/ok to test 4898bde

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

leofang · 2026-05-30T18:45:53Z

/ok to test fe6d2bb

github-actions Bot added the CI/CD CI/CD infrastructure label May 22, 2026

Drop cpython-freethreading from CIBW_ENABLE (default in v4.0)

2598994

leofang commented May 22, 2026

View reviewed changes

leofang self-assigned this May 22, 2026

leofang added packaging Anything related to wheels or Conda packages cuda.bindings Everything related to the cuda.bindings module P1 Medium priority - Should do labels May 22, 2026

leofang added this to the cuda.bindings next milestone May 22, 2026

leofang added 2 commits May 22, 2026 22:59

Expand test matrix: arm64 3.15, Windows 3.10-3.15

38ec741

- Add arm64 entries for 3.15 / 3.15t (linux pull-request) - Add Windows pull-request entries for 3.10, 3.11, 3.14, 3.14t, 3.15, 3.15t to keep in sync with main

Windows test matrix: dual LOCAL_CTK for 3.10/3.11, use 12.9.1 for 3.13

8a2c9c3

Exclude Python 3.15 wheels from release publishing

fe6d2bb

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

leofang marked this pull request as ready for review May 30, 2026 21:47

leofang mentioned this pull request May 31, 2026

Add Python 3.15 to the test matrix #2108

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leofang commented May 22, 2026 •

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